Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ad3aacd4c821ea4123b23a1d8f2508c976c9ea8cdad306e9920612063813b2d9' 
  AND token = 'GR0XSK7/oVherZfe42pyzJPhuqmDDWqu8UaDNrYtuio=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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