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SELECT 
  1 
FROM 
  cscart_multi_declock_keys 
WHERE 
  key_id = '37a3043797798aacd2368c9b57cbd480c3258acfe9e06b5cdb51a30e2338645f' 
  AND token = 'JwGFAqBREwGa7oH9W2c2lJlIkD7RNAEKikc3HSSn4jo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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