Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5f8a7b1652894b96b70eccc518833ca61c8356a920d095d077705afad8cd77c1' 
  AND token = 'tD3OqdMsfXywAuGUUYJa3yI2prRZJdyqLV+ZQsxPme8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}