Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ad56d008782efdd32f01924467e6dbcd9562e4294a6887d10edd14d9bb9fd2e0' 
  AND token = 'o02TXFwvfDfpMfG6qZjoqnBBQ/AFM/sJWmwRqKXmx4w=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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