Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e20fbdbc761feca5d62c02428220b43d33ce06df7c25647a11ab333cbff60a9b' 
  AND token = '7ocuMK5BincQOCImBcQoBtGosi4CAJVfg8SlW0TnNcI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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