Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4e08a09085caf28a94e390afec497cd98a7d1fbe5969680258c82451e077c316' 
  AND token = '5mhNeZXiNPo+yI84TlSU0sbN6uExDtrp2OIlEGf6so0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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