Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3fd08d090cc939209f1b2a736742ff60de460165e9904595e4054558202f3020' 
  AND token = '9JXjInw6VsmhiQySCCQynuPIpH4YCtg0th1e2iMne+Y=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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