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SELECT 
  1 
FROM 
  cscart_multi_declock_keys 
WHERE 
  key_id = '988ac22f2827ffae30153b8acfdbdc54aaf3176373bd10f945cc25ef28352349' 
  AND token = 'W9ygCnvtrdfy/yFMCaLEEPxQT9yv9KlOQ7xW7c5S4H4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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