Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e6531ef391f4015332df55a0b65c9ba85fb3474bb6b60e6fc604501692fa9560' 
  AND token = 'M57gdsW7NRGj+PHKHiEW/uFsKY2IROyslVA7efBkR8I=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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