Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '48f8a3deb3f28696ad5d5ff28c36316f2895a95493c158e9d65d58ff847ee2be' 
  AND token = 'NLqVR1v16ONJ7zva2SawvSuexRDMjZNCfup5DMNqy/g=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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