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SELECT 
  1 
FROM 
  cscart_multi_declock_keys 
WHERE 
  key_id = '444fd24dc783b1ab446ef8f3ad4e14d136d5f8b9f1784aebebfb3440514f4d8a' 
  AND token = 'xqXsZYvAOV7fm9yBte46VUsRzUytE3JFsgUOvTXSjK8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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