Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '08ba7396e6d6c5368c4db1ef07387925f27309a63e05fec4eeea50539e51c7c0' 
  AND token = 'RZ3DxBf0PHA38Zg2XAJrSowEC5lDGU5wE/ZMwAioxyI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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