Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2f61ff1df9e536f798d3a14dd860696696b9c27fc09f113696e15aaea0f52bfc' 
  AND token = 'No/87OCBFC2VQBBeohpLYcQiUAmzJCFl8JhbQswi4dA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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