Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c51ac2170b6a623b0396c64007ab02ff4f68fd90e93ecf415402b6e34ba2f64f' 
  AND token = 'vG21o8KQnVLYDntnTgapeO+WYHwbm/hy0Qcp8oSWNc0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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