Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b9acdac7807041d58b7f9e5ce5bae24efea8e3e3c2bef3b2b88b4ded78f34ae0' 
  AND token = '+Q75xipiLpueW7uf+OIfXfXFQ+xAoLQOfe5H0m2lMBQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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