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SELECT 
  1 
FROM 
  cscart_multi_declock_keys 
WHERE 
  key_id = '52f59fac789d23dd5e3735bec60a87c8395b7d9a07ea3c7fbfcef50f9b9b83a1' 
  AND token = 'H9hVmqjVyT0DB09kOeoORZ+SKzG/TOA0Gspj12WeQ9Q=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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