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SELECT 
  1 
FROM 
  cscart_multi_declock_keys 
WHERE 
  key_id = '6341db6cf6074f10716554bd0f6f25f7b1133a85c927c668f3fbc6cca02a9952' 
  AND token = 'xVVhukiebIfB9hb5EAp/1iJ+nf0ZdCoRdhhokkn/QXk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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