Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2dd41fd5461c10c32e20214871162179d12257f6a6472a00701a3c59eb6ee17c' 
  AND token = 'PKvG/Dk15rkJ0vNr1csu83bqYMNAcUKpAffpMlStO6w=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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