Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f51da797f7ec9a3d52e6b0e3bf5119cd2ba02b956e8c1631b827c8f626513985' 
  AND token = 'XLn+IDE5gcqmU3RQMDAGCNqQP6N6gnSqJYCtuinRvzM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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