Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f398eed7f07f7a023cdbe5f04f412d5001446abeec5623b4457b0f7c58bba7c0' 
  AND token = 'NCGLrF5s4RvdMzaT3ZzvhaScHYY2jpQ4ybU/6O8fCHQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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