Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9643784c2d55c5a5d91697d1e8c3c459ca4e8a40b4a7ac5184753a5a55c6bbc4' 
  AND token = 'rlef3WGxVyA7ftU4QoqkfdUINY7+TeLpya0P81Zgbfo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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