Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '575e21d87c7cd437b690a1121da7b74e535195003d33b2ae6ece823bc2e51245' 
  AND token = 'ooc8a80vxz+ycP+iPFmAQrYn6IYeJ18WM822j4oJA0Y=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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