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SELECT 
  1 
FROM 
  cscart_multi_declock_keys 
WHERE 
  key_id = '0f94e7c0b5de9a2eb5acdc46218eb44f1982a24c6bd2b23c72729c35270ad454' 
  AND token = 'kByXyb5wagfDqbuxjos6ldjgMLZVa/meSRY5QGR9Xuw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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