Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '81915f98b9dba1173e931d455aa3a780df2b4d737ed4879e13c9fff06237e8b8' 
  AND token = 'a8bI9PVMdvScuTIF5Rh4esUSNLdyRTWLvmAbY7XoHc0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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