Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'dab2a4fcc48ea471b5426631465e3ffca813c44fa7cde712eb0d4483d920addf' 
  AND token = 'P7hRT5aj7BVVMyy9ZCTHgZ4TfIPO97EVnBDuFHH/ygc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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