Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9be9fdd017f62b6cf7bcb65ca479bf22f67a6e270607864853a6bb82c5bf242a' 
  AND token = 'jxG8c7tV3JtndMDTRcX53L0IoXjUyVMphXf6OndziWc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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