Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '775957d7889ac4b85aa32973ea1547564410e8f4aefb0363e8450d485cf1be0b' 
  AND token = '9pKXfODdnh8rhx8psxB0Utv0cUp9itUiBsiarirLswY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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