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SELECT 
  1 
FROM 
  cscart_multi_declock_keys 
WHERE 
  key_id = 'fb68f4781085516717e06ff7b87e10991eb95979bcc1b4d700ddef90ed92f431' 
  AND token = 'yW4abbjqGJsTJrz7G59V7aijspU1t3W2HUSmmSuAvrU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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