Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'cfe679feb2fa514f3c1195e65c4549b113b87bdab29c3aeb9e585cfcfd8a5e2f' 
  AND token = 'Lm4ZvV1346KrjYqO7Yh97kEucL6nyKWNf1WXABkEAk4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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