Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd0c268c1508ddde8ae721f2a8098c74e2c6b3ceb860225d64e800f8e5218cf21' 
  AND token = '/eVmEfk8A+BF24uoOoICSdQjzIZ5x2iQ0N0OTQsFtrU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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