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SELECT 
  1 
FROM 
  cscart_multi_declock_keys 
WHERE 
  key_id = '244b8d59d20bcbc0ab8907b44adc62a9619c1e94e06762c2322e01bd840adb1f' 
  AND token = 'tn+Ej0dHgjickH//Y0P3s4OoQA7jL8KCraCpVDB+Wjs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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