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SELECT 
  1 
FROM 
  cscart_multi_declock_keys 
WHERE 
  key_id = 'cde5343dd2affa737499cf823d5a3d9b352b7a9cc3f10660132523ee7f3698e0' 
  AND token = 'pj0ZlUmsTGjKM5N21tdGlpMxbZhPeccYh6886hlUAl4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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