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SELECT 
  1 
FROM 
  cscart_multi_declock_keys 
WHERE 
  key_id = '5443424fde95deedc9cda8f4e8f0b002df448bd24c819851ae1dfe0f8947b8b7' 
  AND token = 'gZ+M9raDDUGpQFRKglPRy5woNrx5ICzCWF6fY621IIM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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