Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b1b9e2b3fcbe0939bfbfd2a6decd1c58431f70e91273cc2d926c91500e0f81a5' 
  AND token = 'lBLQrhcC7cin5D2wpsvdkQ0NNfX+cyDctOwCIKtkrv4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00047

JSON explain

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