SELECT 
  1 
FROM 
  cscart_multi_declock_keys 
WHERE 
  key_id = 'e7199da4ec0e2b28f9b9f2410eb56511a0cf082a8bfab70ea21b069a0a3687a3' 
  AND token = 'YxjQx6TEdppZGJCdOPRg7s1+CK41JPMGDFID8h6EvhE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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