Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2019c6af4e6ebbddc941fbe0ce53f415de1ebf4dbd34995a131aa86e685290b4' 
  AND token = 'lhk9jlK4zV1X8Vlxuqh80OD2ydkrMlyxdfU5bQ/mMHM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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