Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f937af2e5f1e1fb31452cde7041719e50514131acc52128c200f82169af24df0' 
  AND token = 'R4m4z9IKZ2wvLxlFXci3KpSz+yykv4/kFtWFZclN53s=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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