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SELECT 
  1 
FROM 
  cscart_multi_declock_keys 
WHERE 
  key_id = 'a18bad6f6c70d49337c52e4323fe317d93f6c8b2baf94a856cd11cbf115cff80' 
  AND token = 'JtrQDCvYhEu3GTAWuf8+bOxVS1khbLge1ckW/XIRMvU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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