Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b690dd23c1f7cfcd2d48be792500baf4aa68b551c8d7490648de564aed5ae740' 
  AND token = '7FBQhYpyFmyoPV2kQwLICKQGtGE1E4lGO4+gsblEQXo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00051

JSON explain

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