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SELECT 
  1 
FROM 
  cscart_multi_declock_keys 
WHERE 
  key_id = 'cfbdf36b222c0851d1b3cd668e1ddbd5e25d96855daf640a58ea20636afe7fc5' 
  AND token = 'CJ+fCGz/Eo9PUKQ0y82Are6pCkE11IqNbHOpslL6lZs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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