Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b8ccc0528e481dc4a47eca218b928f846b3f7899e4081c2ca4ae78bca524fae3' 
  AND token = 'p88DMtsuErSd4777/wKuSq3fcsFMmyCx2K6PRCP9FxM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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