SELECT 
  1 
FROM 
  cscart_june_setuplock_keys 
WHERE 
  key_id = '0a0d65d37195bfb13ed454d4c36a15b32df0783c6c81803490f9c6e3fd8a9271' 
  AND token = 'JwCfAR1DNPB1qwAcbm1Hwl0JwGeLJpJikB01ivxH5ZQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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