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SELECT 
  1 
FROM 
  cscart_multi_declock_keys 
WHERE 
  key_id = '42ee0bce0881b4ad74540f880e769fd01577f4525afa2a7c48fc15c9bb205426' 
  AND token = 'xi36XEiv6Y9cekU3/4M7vtYnWXorr7UHHgw8ceKZ9aY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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