Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a3db6c4d776176febfc1e118c5670e8e429567b0616a8128d2949841d4fd53ed' 
  AND token = '16sk8xjk4+pnPQ7uWBIxaOGrE284CsuubotmbUE7AXY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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