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SELECT 
  1 
FROM 
  cscart_multi_declock_keys 
WHERE 
  key_id = 'f8469a62ed5d0939f0002d0ee5ba99a1b9e71644c53a2d6d86561a13ebd204ac' 
  AND token = 'E94RH5Xpu0UtUhBkTdzgp3Ui1MKKMEkpgikRBO6Yb2Q=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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