Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8cb00411e23b22265c1608363fd1e22b75286e09cadc20eb86f647e0aa72e246' 
  AND token = 'Zd74M4bNmP3Dkir4PebYRI8CTy+FGpNtingvTGoDNRo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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