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SELECT 
  1 
FROM 
  cscart_multi_declock_keys 
WHERE 
  key_id = 'd3fdc457fb3e661ae84f03943551de8333b591ac22965c4980777acef2053451' 
  AND token = 'pa5FfmhGrtmyz0AJucFXx3pkV0EIPi9Hn/lV9j7FIwU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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