Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9f2278fcd644621ae05bc518254880eed9f05c65591b77fa4e90a9f44ed21f8a' 
  AND token = '+8j9pilxi6ADn40bF6mmHjG3kqNUmDn+kL2EyFrUAdo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00016

JSON explain

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