Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '56ce5aaeb01667840aea9dadfb79f69dfdfa6d89a7b64b6e2fafb2c3b9355eb2' 
  AND token = 'r5L3Y90o0dEpS23cINUZfOo2XA0eAtAy3hYJwr8awSk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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