SELECT 
  1 
FROM 
  cscart_june_setuplock_keys 
WHERE 
  key_id = '134633428585c176d01e2c0f855881f230992af14ae90a4651c47a6370e8739f' 
  AND token = 'Ju6SDoz65oiWcmegb+h5FBLsg4dwICiQ7XFuqHDFVFQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00047

JSON explain

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