Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c53dc17fb596d79e819c277c61618a15a86ba7c7a88dd20c988ac9af7cad7145' 
  AND token = '+cDfdkFi77mN44Qd7aeESJjmwkXgCAa972jS3GKZtsQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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