Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e30312583adf5f0afdac86e20388ff6ad13557d3f66806f104846dcd4f51ff6a' 
  AND token = 'nw6Sypj2TnMiakQ4jEV/v3btlucyMm4Qav532Nx3St8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00047

JSON explain

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