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SELECT 
  1 
FROM 
  cscart_multi_declock_keys 
WHERE 
  key_id = 'bdc84173293d01371d039617e1322101768497e959dcf18a17995355688852b5' 
  AND token = 'opwwD9yR8p4LAI/WH6iuIV69pCWSuRe5HzsBXgsYWEg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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