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SELECT 
  1 
FROM 
  cscart_multi_declock_keys 
WHERE 
  key_id = 'beda70fab7d56a713d41b998b38a5ac337fd20165d124e7557c56bf170586626' 
  AND token = 'hmSOxRkOMB9KOKRhRrn+TMvfayO/RO9iVOHOzzy1HeA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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