Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3195a5c0d7a2be0329c5b7fc33b3829ae3b9d2cea0faaea9d6d18cbeddc3fe9c' 
  AND token = '1WBoVO4Dlh+I2pnecsxTLK35w9GKoagcLpbhsFxT3AU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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