Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4d00868dc1fa0cf089b417cd68d20e55c1c67c4a0466b03bd1f9146e201e404d' 
  AND token = '1Y/amI4Id6lPxD9bOvthu0ELZOfxhRFwxdHvJ9Qfihg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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