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SELECT 
  1 
FROM 
  cscart_multi_declock_keys 
WHERE 
  key_id = '12e969c489e0cb3ac42adac05309e08965ec62610575df62a1989212e23e6a28' 
  AND token = 'y92VbSrr7Qq3kma+FnuhnZQdXy2fCjUyK8VGJ3UMxS8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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