Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '71177fb1073b1b45eb8466fe6b9e7c9807b5b7028c9c10bcaa0e5c4c8649bcc5' 
  AND token = '63vfEjULiGKhYT3qloaOofcxxYgSDkm/hmEUgHi+Kg4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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