Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f391388a2d1365bd206649c0d62fca71b7275973d04df0c03ed6ede7b1abbbd8' 
  AND token = 'YiN+Qj1xN2YLd7CxVvbPSeShVT+Uupa0M8c3rnxMDfY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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