Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '683da2c9f2f8bdf97456572ae92cf1df8289ed49b08d3d24de0944ea83b8e142' 
  AND token = 'RxpSKegZI7rLxvNCOgshWS3jonEOvFOVdtmuWVsTVec=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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