Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '73ca0732d188d1d5a636159b6b80bf2712472f391bd0deb498c48d6b88313a3d' 
  AND token = 'jNVRvWIB3yDvYGjCg3L4VsdE9C+96BGdGLtU3RnS5wQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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