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SELECT 
  1 
FROM 
  cscart_multi_declock_keys 
WHERE 
  key_id = '09101d413ab861859f2c7f4711529b1f2d412c71b08f03af0e82a9b5c193528b' 
  AND token = 'dbCukIkZYQYGGilWN+CB2cofFa7l5GhEtgg+zBbUEeY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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