Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'cfc986877cd3d2e4e6b1528693b03aa4375ee516b81af0faa2c3e783892d72ee' 
  AND token = 'c+48+T1kBI8RoNcPoJeHVvp98m+8ZREBsAFplt2xB1E=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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