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SELECT 
  1 
FROM 
  cscart_multi_declock_keys 
WHERE 
  key_id = 'f7ef2d75ee4efaa3e50847710e35c637c9b6e47810b935f7c8883314c36b1138' 
  AND token = 'hZEx7J84l/AQKzK88H25i50hcb7a7ZwU/W2ySo51Yag=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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