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SELECT 
  1 
FROM 
  cscart_multi_declock_keys 
WHERE 
  key_id = 'db68d34491a4b95a570cbb33a3a9ec4c66b14212be2cbae14f64e098e1a94a97' 
  AND token = '0CH4gWEml0CeBMH85WhXWeBIHQJZVbkTFSSv5+fiKUM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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