Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '50eac2e7aaf95aead844082bfe00225906ea41ae2d45fc89a4e93a5304bb5c59' 
  AND token = 'iUDLO10sovl9LamDZ6Fh5BKpzjY87ZehuE67gWo3jk8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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