Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c2f0b38037774047b2f773da3e40ad57b9e9c8f047300f2cf9af84c9bb03b831' 
  AND token = 'F5zyny7P+vu3ONZPJLmUqE0xIaxmypSMoiHnps2W/3I=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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